Chegg Solutions for Microelectronic Circuits (Adel S Sedra, Kenneth C Smith) (Z-Library)_parte_1383

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Step of 3 12.015E Refer to Figure 11.37 in the textbook for the small signal analysis of the internal circuit of the LM380 IC power amplifier. The current directions of each transistor have indicated with the arrow marks as shown in Figure 11.37. Consider the node 14 at the collector terminal of the transistor, The current through the collector of the transistor, is, The current through the collector of the transistor, towards the node 14 is, The total resistance between the collector of and ground is R. Apply Kirchhoff's current law at node 14 (collector terminal of ). + = A + = A 2Rv, Rv, = A 2Rv, = A Step 2 of 3 Rearrange the terms to determine the voltage gain. 2R = AR2 = Simplify further. - = v, - = Thus, the gain of the amplifier is, Step 3 of 3 The condition is, AR Use this condition to reduce the gain expression. Therefore, the gain expression is, = = Thus, the reduced the gain expression is,